Hibernat之关系的处理一对一处理

第一步：编写两个pojo，比如一个学生表一个班级表  这里使用注解。

需要

公司表:

package com.qcf.pox;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class Company {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;
    private String name;
    @OneToOne(cascade=CascadeType.ALL)
    private Address address;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    public Company(int id, String name, Address address) {
        super();
        this.id = id;
        this.name = name;
        this.address = address;
    }
    public Company() {
        super();
    }
    
}

地址表：

package com.qcf.pox;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class Address {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;
    private String name;
    @OneToOne(cascade=CascadeType.ALL,mappedBy="address")
    private Company company;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Company getCompany() {
        return company;
    }
    public void setCompany(Company company) {
        this.company = company;
    }
    public Address(int id, String name, Company company) {
        super();
        this.id = id;
        this.name = name;
        this.company = company;
    }
    public Address() {
        super();
    }
    
}

第二步：在hibernate.cfg.xml文件中引入这两个po类

        <mapping class="com.qcf.pox.Address"/>
        <mapping class="com.qcf.pox.Company"/>

第三步：编写测试代码

package com.qcf.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

import com.qcf.pox.Address;
import com.qcf.pox.Company;

public class TestOneToOne {
    public static void main(String[] args) {
        Configuration configuration=new AnnotationConfiguration().configure();
        SessionFactory factory=configuration.buildSessionFactory();
        Session session=factory.openSession();
        Transaction transaction=session.beginTransaction();
        Address address=new Address();
        address.setName("beijing");
        Company company=new Company();
        address.setCompany(company);
        company.setName("zhandaf");
        company.setAddress(address);
        session.save(address);
        session.save(company);
        transaction.commit();
        session.close();
        
    }

}